Sequential simulation of 3D geometry of complex plant that is faithful to botany may occupy a lot of computer resources. In this paper

a method of building complex structures begun by the simplest stems is presented; the simpler substructures are pasted recursively to form more complicated branches. In doing that

the repetitive structure in plant is computed only once

and then can be reused according to its index

thus this method can increase computation speed of complex tree structure

and decrease storage size for the geometrical information as well. These information includes not only geometrical data of the simulated plant at each growth cycle

such as orientation and position of each botanical organ

but also that of each substructure. Although substructure method is a top-down algorithm that is inverse to growth sequence of plant growth

it is shown in this paper that bending branches can still be simulated in this way

as well as reiteration and inflorescence structures

which shows the generality of this method.